Magnetic properties of samarium and gadolinium co-doping Mn-Zn ferrites obtained by sol-gel auto-combustion method

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• 作者：Bifa JI (季必发)^a ; ^b ; Changan TIAN (田长安)^a ; ^{tca2204@126.com" class="auth_mail" title="E-mail the corresponding author} ; Quanzheng ZHANG (张全争)^a ; ^c ; Dongdong JI (吉冬冬)^a ; Jie YANG (阳 杰)^a ; Jinsong XIE (谢劲松)^a ; Jingyu SI (司靖宇)^a ; ^{sijyo@hfuu.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Mn-Zn ferrites ; co-doping ; sol-gel auto-combustion method ; microstructure ; magnetic properties ; rare earths
• 刊名：Journal of Rare Earths
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：34
• 期：10
• 页码：1017-1023
• 全文大小：1750 K

文摘

Mn-Zn ferrites doped with different contents of Sm³⁺ and Gd³⁺ ions were prepared by sol-gel auto-combustion method and characterized by Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TG), X-ray diffraction (XRD), scanning electron microscopy (SEM) and vibrating sample magnetometer (VSM). When samples were calcined in a relatively low temperature below 1100 °C, secondary phases (α-Fe₂O₃) could be identified. Therefore, in order to acquire pure and better crystallinity, the suitable calcining temperature of powders was selected at 1200 °C. It was also found that all the samples consisting of ferrite phases of typical spinel cubic structure and average crystallite sizes between 31.5 and 38.2 nm were obtained after calcining at 1200 °C for 4 h. The lattice parameters increased almost linearly with increasing Sm content. A dense microstructure was obtained after sintering at 1250 °C for 4 h. Through the analysis of magnetic properties, hysteresis loops for all the samples were narrow with low values of coercivity and retentivity, indicating the paramagnetic nature of these samples. And saturation magnetization M_s strongly depended on the type of additive to reach a maximum of 47.99 emu/g for x=0.015, which showed a great promise for hyperthermia applications.